1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
maxonik [38]
3 years ago
6

Imagine the average time to complete a “4-year” bachelors degree is actually 4.3 years based on national data. You collect data

on the 20 psychology students who started school during the same semester as you, finding an average time to complete at 4.5 years, with a sample standard deviation of 0.5 years. What is your 95% confidence interval? (for your FINAL answers, round to the nearest TWO decimal places)

Mathematics
1 answer:
Nataly [62]3 years ago
8 0

Answer:

To answer you question, we need the confidence internals formula, μ±Zc*(σ/\sqrt{N}); N is the 20 psychology students, 0.5 the desviation standar and 4.3 is the medium based on national data, every fact in years.

Step-by-step explanation:

You need to consult the Zc value, you can find this table attached in this question; for 95%, we have a Zc value of 1.96.

Next step replace values: 4.3±1.96*(0.5/\sqrt{20}) = 4.3±0.22 (rounding the result)

So, the confidence interval are:

4.08cm≤X≤4.52cm

You might be interested in
Find the x- and y- intercepts of 2x -2y = -6
Sonbull [250]

2x-2y=-6

-2y= -2x-6

y=x+3

Y-intercept= 3

X-intercept= -3

8 0
3 years ago
Read 2 more answers
How do I factor this:
bija089 [108]

x²+6x²=7x²

then the rest is done for you

7x²+12x+8

8 0
3 years ago
Plz help I need to know how many bags of snacks they bought in all
spin [16.1K]

Answer:

7x - 2

Step-by-step explanation:

let x be the number of bags of chips, then

3x is the number of bags of pretzels ← 3 times the number of bags of chips

3x - 2 is the number of bags of nachos ← 2 less than bags of pretzels

total snacks bought = x + 3x + 3x - 2 = 7x - 2



6 0
3 years ago
Lexi operates an orange juice stand. On Monday she used 4 bags of oranges. On Tuesday she used 1/2 as many oranges as on Monday.
Brut [27]
2 bags of oranges, 4/2=2
4 0
2 years ago
. If α and β are the roots of
Lostsunrise [7]

Answer:

18x^2+85x+18 = 0

Step-by-step explanation:

<u><em>Given Equation is </em></u>

=> 2x^2+7x-9=0

Comparing it with ax^2+bx+c = 0, we get

=> a = 2, b = 7 and c = -9

So,

Sum of roots = α+β = -\frac{b}{a}

α+β = -7/2

Product of roots = αβ = c/a

αβ = -9/2

<em>Now, Finding the equation whose roots are:</em>

α/β ,β/α

Sum of Roots = \frac{\alpha }{\beta } + \frac{\beta }{\alpha }

Sum of Roots = \frac{\alpha^2+\beta^2  }{\alpha \beta }

Sum of Roots = \frac{(\alpha+\beta )^2-2\alpha\beta   }{\alpha\beta  }

Sum of roots = (\frac{-7}{2} )^2-2(\frac{-9}{2} ) / \frac{-9}{2}

Sum of roots = \frac{49}{4} + 9 /\frac{-9}{2}

Sum of Roots = \frac{49+36}{4} / \frac{-9}{2}

Sum of roots = \frac{85}{4} * \frac{2}{-9}

Sum of roots = S = -\frac{85}{18}

Product of Roots = \frac{\alpha }{\beta } \frac{\beta }{\alpha }

Product of Roots = P = 1

<u><em>The Quadratic Equation is:</em></u>

=> x^2-Sx+P = 0

=> x^2 - (-\frac{85}{18} )x+1 = 0

=> x^2 + \frac{85}{18}x + 1 = 0

=> 18x^2+85x+18 = 0

This is the required quadratic equation.

5 0
3 years ago
Read 2 more answers
Other questions:
  • sarah earns $3,120 every month her monthly expenses total to $2,130 determine how much money will be spent on rent
    7·1 answer
  • Factor completely 16x^2+40x+25
    15·2 answers
  • A digital scale reports a 10kg weight as weighing 8.975kg. which of the following is true?
    12·1 answer
  • It takes Owen 18 minutes to walk to school. It takes him the same amount of time to walk back home. He will walk to and from sch
    15·2 answers
  • If f(x) =5x, what is f(6)
    15·1 answer
  • Debi's parents want to share 300 tokens equally among the 9 friends.After Debi's parents give each person the same number of tok
    12·1 answer
  • HELP ME PLZ! I will not accept non sense answers. BRAINLIEST will be given to the person who gets it correct with full solutions
    14·1 answer
  • Problem
    10·2 answers
  • HELP ASAP (Brainliest)
    10·1 answer
  • A. Not a function <br> B. Function
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!